This Necronomicon was written originally in Eocene, a language which was still at least partially understood by some humans in the early 20th century. It had, however, been written in fragmentary form or become that way by this time. Original illustrations accompanying the book were done by a man named Roerich, although their form actually matched that of identical stone carvings present on Earth, Veltroch, Exo Three, and many other planets. These illustrations depicted the Great Old Ones, which the text refers to as the Great Ones, walling their bodies into stone citadels. (PROSE: White Darkness)

all sources of information on this were affected in differing degrees by Celestis technology

According to the Eighth Doctor, the 20th century author H. P. Lovecraft wrote in his stories of a fictional tome of his own invention, the Necronomicon. By Compassion's time (the 26th century?), he estimated there were no less than seventy-nine different fake Necronomicons in print due to Lovecraft's writings.

Compassion, while acutely affected by a fictional generator which drew her into its narrative, authoritatively claimed that gothic writers often included excerpts of the Necronomicon in their novels, with little understanding of their context. This recklessness helped paint alien races like the Elder Things as monsters. (PROSE: The Taking of Planet 5)

As The Taking of Planet 5 indicates, the Necronomicon was the fictional invention of H. P. Lovecraft and many hoax Necronomicons have been published since his time. Lovecraft encouraged writers in his circle to borrow ideas like the Necronomicon for their own works to create a sense of verisimilitude. Other fictional Cthulhu Mythos tomes created by his fellow writers have also appeared in Doctor Who.

The Banquo Legacy largely represents Lovecraft's in-universe history of the book. The couplet is attributed to the Necronomicon in The Call of Cthulhu. In the same story, the R'lyeh passage is indicated to be known to Cthulhu cultists and is implied to be the message the Great Old One sends in its sleep.

White Darkness presents a smattering of sometimes oblique references to Lovecraft's writing. Another Roerich and what becomes the Ashes of Noah and essential "Saltes" are only tangentially connected to Lovecraft's Necronomicon.